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Question

The cost of running a bus from A to B, is rs.(av+bv), where v km/h is the average speed of the bus. When the bus travels at 30 km/h, the cost comes out to be rs. 75 while at 40 km/h, it is rs. 65. Then the most economical speed (in km/h) of the bus is
  1. 45
  2. 50
  3. 60
  4. 40

A
60
B
45
C
50
D
40
Solution
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